Power grid real-time risk assessment and precontrol method

The invention discloses a power grid real-time risk assessment and precontrol method and relates to a power grid risk precontrol method. At present, global extreme weather events are frequent, and meteorological disasters frequently occur, bringing great harm to an electric system, so that the risk of a power grid caused by weather change is urgently needed to be assessed, and the safety of the power grid is needed to be improved. The power grid real-time risk assessment and precontrol method comprises the following steps of 1, calculating the outage rate of an electric transmission line; 2, calculating the outage rate of equipment; 3, performing risk assessment of the electric system, wherein the risk assessment comprises the running risk assessment of loss loads and the running risk assessment of short-time overloading, and sorting the loss load risk and the short-time overloading rate risk; 4, automatically generating a fault set, calculating the fault set in real time according to the real-time topology information and a transfer ratio among equipment, dividing the fault set into a plurality of levels, and corresponding multiple levels of fault sets to multiple levels of limits. According to the technical scheme, two aspects of accident occurrence probability and accident consequence severity are comprehensively considered, and people can comprehensively and clearly know the encountered faults when the electric system runs.